Career Case Study Management Porter 
Harvard Business Review
NOVEMBER 22, 2012
Sometimes, it seems they've always loomed large: for decades, Michael Porter has been synonymous with strategy, and John Kotter with change management. In March 2001, Groysberg writes in his case study, NBC's Today show had a rash of guest cancellations due to a snowstorm.
Harvard Business Review
JULY 22, 2015
Of course it was natural for a boss to have mixed feelings about seeing a valued employee move on, but David was more than Mark’s manager: He was his mentor. He’d always pushed Mark to advance in his career, and this was an internal promotion, on a three-year contract, so they’d still be working for the same company.
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